feat #15 : Global Exception 구현

be/src/main/java/com/issuetrackermax/common/exception/ApiException.java

@@ -0,0 +1,18 @@
+package com.issuetrackermax.common.exception;
+
+import org.springframework.http.HttpStatus;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+public class ApiException extends RuntimeException {
+	private final HttpStatus httpStatus;
+	private final String message;
+
+	@Builder
+	private ApiException(HttpStatus httpStatus, String message) {
+		this.httpStatus = httpStatus;
+		this.message = message;
+	}
+}

be/src/main/java/com/issuetrackermax/common/exception/GlobalExceptionHandler.java

@@ -0,0 +1,15 @@
+package com.issuetrackermax.common.exception;
+
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import com.issuetrackermax.controller.ApiResponse;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+	@ExceptionHandler(ApiException.class)
+	public ApiResponse<ErrorResponse> apiExceptionHandler(ApiException e) {
+		ErrorCode errorCode = new ErrorCode(e.getHttpStatus().value(), e.getMessage());
+		return ApiResponse.exception(ErrorResponse.exception(errorCode));
+	}
+}